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Summit and CC BEC question

I installed a savox servo in my stock summit along with a CC BEC set at 6.0v. When I am running lipos I have no issues. Truck works great. No brown outs in either first or second gear.

But when I run my 3000 mah 7 cell nimh batteries that came with my Summit, the truck will go dead for a quick second when I do a full acceleration pull in second gear with the steering locked full left or right at the same time when using only those Nimh batteries. Doesnt' do it with the lipos. any idea why this is?

All the BEC connections are good. LED light is on in the CC BEC which is supposed to indicate all is operating good. Just wondering if this is normal with the nimh's cause the quick brown out has not happened once when using the lipos with the BEC. Can the nimhs not provide enough power when the draw is at its highest?

The nimh struggle to supply the amps being requested. This is a heavy truck add in a bunch of servos.
now a higher powered servo as well. The lipo are able to supply what is being requested.
The bec can only regulate what it is given. The nimh can barely supply what is needed fast enough for this truck as it is.
the by-product of demand not being met.....just like work. HEAT....LOL. batts do not enjoy excessive heat at all

Thanks for the feedback and the confirmation. I figured the nimhs couldn't handle the massive power draw from the truck in 2nd gear, full throttle take off and steering jacked full left or right from the power hungry savox servo. The lipos handle it all just fine. Just another interesting example of how far battery chemistry technology has come over the years.